Strap for La Grande Classique Tonneau 35 Diamond

The lug width of the Longines La Grande Classique L4.789.0.58.6 is 20 millimetres. This measurement is critical for selecting a compatible strap and represents the distance between the two attachment points on the case. To verify, measure the inner seat of the lugs with a digital calliper or consult the official Longines technical documentation.

The most suitable strap depends on usage and aesthetic preference. For formal occasions, we recommend chocolate brown or black alligator with vegetable tanning; for everyday wear, natural calf or silk NATO strap; for humid environments, hydrophobic rubber with stainless steel deployant. All available in 20mm size on MilanoStraps.it.

Strap replacement is performed using a spring bar tool (or dedicated strap removal tool) to remove the pins that connect the strap to the case. Position the watch gently on a soft surface, identify the pin removal direction, and push them laterally with firm but controlled movements. Align the new strap's lugs with the case holes and reinsert the pins until they click into place.

Yes, it is entirely possible. The 20mm lug width is universal and aftermarket straps crafted by specialised artisans (such as those from MilanoStraps.it) comply with quality and durability standards. Ensure the strap is manufactured with straight lugs compatible with your model's technical specifications.

The lifespan of a leather strap depends on tanning quality, intensity of use, and environmental conditions. An alligator or calf strap with vegetable tanning, worn daily, typically lasts 3-5 years. Exposure to moisture, perspiration, and direct sunlight accelerates ageing. MilanoStraps.it straps include an 18-month warranty against manufacturing defects.